Study on the D iameter Distr ibution Model of ShortRotation Euca lypt Plantation

CHEN Yong-fu

To select normal function, β function, Γ function, Weibull function, logarithmic normal function,logistic function, Poisson function, Neyman A function, negative binomial function, binomial function, geometricfunction and logarithmic function imitate diameter distribution of the clonal stands of U6 Eucalyp ts in Lei ZhouForestry Bureau, the fiting rate of normal function was 88% , fiting rate ofβ function was 83% , fiting rate ofWeibull function was 81% , fiting rates of other distribution functions were low than 50%. β distribution functionwas the best for imitating diameter distribution of the clonal stands of U6 Eucalyp ts in Lei Zhou Forestry Bureau.Accordingβ distribution function, the dynamic forecastmodel of diameter distribution was established base on standage, site index and stand density. To examine the p recision of dynamic forecastmodel of diameter distribution, fortysamp les which were not adop ted to establish model were used, the difference between estimating walue andmeasuring value was not notable, and the correlationg coefficientswere higher than 0. 9.

1. Research Institute of Forest Reource Information Techniques, CAF, Beijing　100091, China

Received Date: 2007-12-10

Abstract: To select normal function, β function, Γ function, Weibull function, logarithmic normal function,logistic function, Poisson function, Neyman A function, negative binomial function, binomial function, geometricfunction and logarithmic function imitate diameter distribution of the clonal stands of U6 Eucalyp ts in Lei ZhouForestry Bureau, the fiting rate of normal function was 88% , fiting rate ofβ function was 83% , fiting rate ofWeibull function was 81% , fiting rates of other distribution functions were low than 50%. β distribution functionwas the best for imitating diameter distribution of the clonal stands of U6 Eucalyp ts in Lei Zhou Forestry Bureau.Accordingβ distribution function, the dynamic forecastmodel of diameter distribution was established base on standage, site index and stand density. To examine the p recision of dynamic forecastmodel of diameter distribution, fortysamp les which were not adop ted to establish model were used, the difference between estimating walue andmeasuring value was not notable, and the correlationg coefficientswere higher than 0. 9.

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Reference (13)

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Study on the D iameter Distr ibution Model of ShortRotation Euca lypt Plantation

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